Valve mechanism for engines.



' J J. DUNLAP. VALVE'MECHANISM FOR ENGINES.

APPLICATION FILED'J UNE 25, I915.

Patented Dec. 11, 1917.

cially withnreterence to steam engines, :the

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balance.

fipecifieationof Letters Patent. V i Patented: D eg 11 1917.

' i AppHe-at on filed June 25, 915 fierial Net 36,337.

lb all wlwm it may concern: 1

and usetul Improvements in Valve Mecha- I nismi for Engines, of which the following is a specification.

wincchanism for engines, being designed espe i and reliablevalve mechanism embodying a pair of rockingor oscillatory valves mount as to operate simultaneously, one to admit and the other to exhaust the-steam from the cylinder of the engine, means being pro vided for the properlubrication of the rock 111g valves and also tor ad usting the valves in relation to each otherto produce the best results and obtain the highest efficiency of the engine.

With the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts, as herein described, illustrated and claimed.

lln the accompanying drawings 1-- Figure 1 is a side elevation illustrating a portion of the cylinder of an engine, also showing the steam chest and valv operating means.

Fig. 2 is a longitudinal section through the same.

Fig. 3 is a cross section on the line 3-? @r Fig. 2.

Fig. 1 is a cross section on the line H of Fig. 2.

Fig. 5 is a plan view of the steam chest showing the valve operating mechanism.

The cylinder of the engine is designated at l in which operates the usual reciprocatory piston 2, the cylinder being provided with the heads 3 and l, 5 designating end casings Which inclose the cylinder heads and the fastening means 6 by means of which the cylinder heads are secured to the body of the cylinder. The cylinder is shown as provided with the usual steam passages '2" and 8, the inlet chambers 9 and 10 and the exhaust chamber 11.

The steam or valve chest 12 in which the valves are mounted is provided with a. series ot internal webs 13 extending longitudinally thereof as best shown in Fig. 4% and these webs =are bored to provide openings 141 13611111l3il11g bilslllllgs 15 to be inserted through the ivcbs andsupported thereby, thesaid bushingzjs, two Oflf wlllcll are employed; containing cylindrical valves 16 and 1 7 eachhaving a generally cylindrical shape and eachof i all-inlet o Thisinvention relates to balancedvalve said valves being formed with L8 and anexhziustcavity 19,

each of sai'd cavities being substantially semieylindrical in cross section as shown in Fig. 2. .Each of-the bushings 15 is provided ivithports 20, 21 and 3'22, the port 20 communieating withthe inlet chamber 12,

thc port 21 beingadapted to registerwith ed in a steam orvalve chestoif novel con structlon, thovalves belng yoked together so i bushing is prov ided"with a plurality of lubri eating holes or ports 23 l to admit lubricating lnaterial totlie outer surface or the valve, the lubricating material being admitted to the chest 12 through pipes 2 1. lleliei valves 25 are shown arranged at opposite ends of the chest 12 to relieve vacuum in the steam cylinder and allow the engine to drift or run free when the steam is cut oil therefrom.

The valves 16 and 17 are provided with stems or shafts 26 passing through stuffing boxes 27 in the opposite sides of the chest 12, the projecting ends of the shafts 26 having fast thereon arms 28 to which are pivotally connected at 29, the substantially parallel and opposite arms or branches 30 of a valve operating yoke. Between the arms 28 of the valves, the branches of the yoke are made longitudinally extensible as illustrated in Fig. 1 wherein turn buckles 31 are employed for the purpose, the construction j ust referred to enabling the valves to be properly adjusted in relation to each other to obtain the highest etlicieucy of the engine.

In connection with each of the steam passages 7 and 8 and located between the valves and the cylinder I employ cutoffs 32 in the form of slides which are insertible in and removable through slots 33 in the bottom of the steam chest, the outer ends of the slots 33 being closed by means of removable plates ever, interfere with the remaining steam passage which therefore permits the piston to be driven in one direction by the expansion of the steam, the piston being returned to the initial end of its stroke by the usual connections such as the piston rod and connecting rod of a locomotive or other engine.

From the foregoing description, taken in connection with the accompanyiny drawings, it will now be understood that the valves 16 and 17 oscillate or rock simultaneously and equally in the same direction, said valves operating alternately as inlet and exhaust valves. The valves are adjustable in relation to each other by means 01: the longitudinallyextensible yoke by Which said valves are operated and the valves are lubricated through the holes or ports 23. The bushings or valve casings 15'are firmly supported in place at various intervals by the Webs 13 thereby making a strong and durable construction and enabling new bushings to be 7 substituted for bushings that have become so worn as to admit of leakage of the steam. Furthermore, as stated, should one of the valves become injured or rendered inoperative for any reason, said valve may be cut off from the cylinder by means of the slide or cut-ofi 32 thus enabling the engine as a whole to continue in operation until an opportunity is presented to make the necessary repairs.

What I claim is In engine valve mechanism, the combination of an engine cylinder, a valve chest hav- 1g internal webs in spaced parallel relation to each other bored to form parallel series of openings, hollow cylindrical bushings inserted through said openings, a pair of roek+ ing valves mounted in said bushings for equal and simultaneous rocking movement on parallel axes, each of said valves being formed with a single inlet and a single exhaust cavity in the outer face thereof so arranged that the inlet cavity is adapted to place the chest and one of the steam passages of' the cylinder in communication and the exhaust cavity is adapted to place said steam passage of the cylinder in communication with the exhaust chamber, and means located exteriorly of said chest for simultaneously rocking said valve.

In testimony whereof I allix my signature in presence of two witnesses.

JOHN J. DUNLAP. Witnesses:

JOHN J MCCARTHY, BENNETT S. Jones.

(Copies ofl thte patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. (3. 

